When I create a triddler, the image is separate from the grid which means I can change the scale of the image to match the grid. This has been helpful sometimes, especially went I don't want the entire image. I can scale up the portion I want and work with it.

When I try to create a griddler, I have to guess the scale without anything to look at because once the image is loaded, it is attached to the grid and I can't scale the image to match the grid. The image in question is 65 squares long and I would like to shrink it to be a simple griddler within the 50 square limit. How can I do that without guessing?

It should be possible to do with math - because the sizes of both images are known. Keep in mind each square is a pixel. So if your image is 65 pixels wide and you want it to be 50, there is bound to be a formula to find out the percentage. However, if you have photoshop or another editing program, it's much easier to resize the image beforehand to 50 x 50 pixels and upload it then into the workshop.